TWI578340B - Apparatus of coupled inductors - Google Patents

Description

Coupled inductive device

The present invention relates to a coupled inductive device, and more particularly to a coupled inductive device that provides a balanced electromotive force.

In Power over Ethernet (PoE) technology, power and data can be simultaneously transmitted from a power sourcing equipment (PSE) to a powered device (PD) while transmitting data. There are many types of power receiving devices, including voice over IP (VoIP) phones, wireless local area network (WLAN) access points, Bluetooth access points, and network cameras. And computing devices, etc.

In Power over Data Lines (PoDL) built on PoE technology, a set of data transmission line pairs will be used to transmit direct-current (DC) power, and the same set of data transmission lines will also be used to send / Receiving an alternating-current (DC) data signal, so there is no need to provide additional power to the powered device. It is well known in the related art that the PoE and PoDL standards are detailed in the Institute of Electrical and Electronics Engineers (IEEE) 802.3 and are not described here.

The adopted inductors of the PoE system usually provide a sufficiently high impedance on the data transmission line pair to support the transmission of differential-mode data signals. The main function of the coupled inductive device is to prevent differential mode noise from being converted into common-mode interference. Common mode interference will change the DC level of the power supply node or the power receiving node, which will affect the stability of the power supply system. In addition, common mode interference will also appear in the signal transmission line pair signal, in addition to causing data errors, it will also become a source of electromagnetic interference (EMI). The differential mode data signal is usually driven by two AC currents of the same size and opposite directions, and transmitted separately on the data transmission line pair. Under ideal conditions, when the two AC currents flow through two coupled inductive devices without parasitic effects, respectively, two electromotive fields (EMFs) of the same size and opposite directions are induced, which are common to each other. Under operation, they can cancel each other without causing common mode interference and affect the common mode operation of the coupled inductor device. However, the inductance in the actual coupled inductive device inevitably produces inter-coil capacitance, acting like a parasitic element such that the two coupled inductive devices are unable to induce two EMFs that can be completely offset, thereby causing common mode interference. In other words, common mode interference is caused by the undesired characteristics of the coupled inductive device in converting the differential mode data signal, and is commonly referred to as differential to common-mode conversion in the related art.

Another major function of the coupled inductive device used in the PoE system is to prevent common mode noise from being converted into differential mode interference. In addition to the poor effects of the aforementioned common mode interference, differential mode interference can also make the power supply system unstable, cause data errors, and become the source of EMI. Common mode interference is usually driven by two AC currents of the same size and direction. When the common mode interference flows through the coupled inductive device, the two AC currents will respectively induce two EMFs of the same size and direction without parasitic effects. They can cancel each other out under differential mode operation without causing differential mode interference. However, the inductance in the actual coupled inductive device inevitably creates differential mode interference across the coil capacitance value. In the related art, the undesirable characteristics of the above-described coupled inductive device are generally referred to as common-mode to differential conversion.

The inventors have found that the presence of cross-coil capacitance values is inevitable due to the physical gap between the coil sets in the coupled inductive device and the dielectric surrounding the coil assembly. The cross-coil capacitance value causes the coupled inductive device to exhibit non-ideal characteristics during differential-to-common-mode conversion and common-mode-differential mode conversion, resulting in common mode interference and differential mode interference. In general, the above non-ideal characteristics are commonly referred to as mode conversions because they are caused by cross-coil capacitance values for the same reason. Therefore, solving the problem caused by the value of the coil capacitance can improve the mode conversion at the same time, thereby improving the stability of the power supply for the PoE system or other systems, improving the correctness of the data processing system, and avoiding becoming an EMI source.

The present invention provides a coupled inductor device including a first electrode and a second electrode disposed at a first end position along an axial direction; a third electrode and a fourth electrode disposed along the axis direction a second end position; a first winding area and a second winding area in the axial direction; a first coil set wound around the first winding area; and a second coil set, wrapped around Second winding area. The first coil group includes a first winding segment having a first end connected to the second electrode and a second end extending in a direction toward the second winding region; and a second winding segment, the first One end is coupled to the first winding segment and a second end thereof extends toward the first end position to connect to the first electrode. The second coil assembly includes a third winding segment having a first end connected to the third electrode and a second end extending in a direction toward the first winding region; and a fourth winding segment, the first One end is coupled to the third winding segment and a second end thereof extends toward the second end position to connect to the fourth electrode. Wherein the first end position and the second end position are respectively located on two opposite sides of the axial direction, the first winding area is located between the first end position and the second winding area, and the second winding The line region is located between the first winding zone and the second end location.

The present invention further provides a coupled inductor device including a first electrode and a second electrode disposed at a first end position along an axial direction; a third electrode and a fourth electrode disposed along the axis a second end position of the direction; a first winding area and a second winding area in the axial direction; a first coil group wound around the first winding area; and a second coil group wound around the first a second winding region; and a compensation capacitor coupled between the first coil group and the second coil group. The first coil assembly includes a first winding segment having a first end connected to the first electrode and a second end extending in a direction toward the second winding region; and a second winding segment, the first One end is connected to the first winding segment and the second end is connected to the second electrode. The second coil assembly includes a third winding segment having a first end connected to the third electrode and a second end extending in a direction toward the first winding region; and a fourth winding segment, the first One end is connected to the third winding segment and the second end is connected to the fourth electrode. Wherein the first end position and the second end position are respectively located on two opposite sides of the axial direction, the first winding area is located between the first end position and the second winding area, and the second winding The line region is located between the first winding zone and the second end location.

The present invention further provides a coupled inductor device including a first electrode disposed at a first end position along an axial direction, and a second electrode disposed at a second end position along the axial direction; a third electrode disposed at the second end position; a fourth electrode disposed at the first end position; a first winding area and a second winding area located in the axial direction; a first coil set; a second coil set; and a compensation capacitor coupled between the first coil set and the second coil set. The first coil group includes a first winding segment wound around the first winding region, a first end of the first winding segment is connected to the fourth electrode, and a second end of the first winding segment is Extending the direction of the second winding region; and a second winding segment having a first end connected to the first winding segment and a second end connected to the third electrode. The second coil group includes a third winding segment wound around the second winding region, a first end of the third winding segment is connected to the second electrode, and a second end of the third winding segment is opposite Extending the direction of the first winding region; and a fourth winding segment having a first end connected to the third winding segment and a second end connected to the first electrode. Wherein the first end position and the second end position are respectively located on two opposite sides of the axial direction, the first winding area is located between the first end position and the second winding area, and the second winding The line region is located between the first winding zone and the second end location.

1 to 6 are schematic views showing the structure of an inductor group of a coupled inductor device according to an embodiment of the present invention. Each of the inductor groups includes four electrodes P1 to P4, two coil groups W1 to W2, and a material body. The coil groups W1 to W2 can generate magnetic flux in an axial direction (indicated by an arrow S _AXIS ). For illustrative purposes, A1 represents the first end position along the axial direction, A2 represents the second end position along the axial direction, B1 represents the first winding area along the axial direction, and B2 represents the axis along the axis. One of the directions of the second winding area.

In the embodiment shown in FIGS. 1 to 4, the material body includes a first core portion 51, a second core portion 52, a first end portion 61, a second end portion 62, and a layer portion. 70. The first coil group W1 includes a first winding segment W1 _F and a second winding segment W1 _R , and the second coil group W2 includes a third winding segment W2 _F and a fourth winding segment W2 _R . In the first to third figures, the electrodes P1 and P2 are disposed on the first end portion 61, and the first end portion 61 is disposed on the layer portion 70 at the first end position A1; the electrodes P3 and P4 are disposed on The second end portion 62 is disposed above the second end portion 62 on the layer portion 70 at the second end position A2. In FIG. 4, the electrodes P1 and P4 are disposed on the first end portion 61, and the first end portion 61 is disposed on the layer portion 70 at the first end position A1; the electrodes P2 and P3 are disposed at the second end portion. Above the 62, the second end 62 is disposed on the layered portion 70 at the second end position A2.

In the embodiment shown in Figures 5 to 6, the body of material comprises a covering portion 85 for carrying or covering the first coil group W1 and the second coil group W2. The first coil group W1 includes a first winding segment W1 _F and a second winding segment W1 _R , and the second coil group W2 includes a third winding segment W2 _F and a fourth winding segment W2 _R . In one embodiment, the covering portion 85 can be a housing for carrying the first coil group W1 and the second coil group W2 having a fixed shape and disposed at a fixed position. In another embodiment, the covering portion 85 may be filled with a specific material to cover the first coil group W1 and the second coil group W2, thereby ensuring that the first coil group W1 and the second coil group W2 can maintain a fixed shape and a fixed shape. position. However, the embodiment of the covering portion 85 does not limit the scope of the invention.

In the inductor groups 10 and 20 shown in FIGS. 1 to 2, the coil group W1 is wound around the first core portion 51 and located in the first winding portion B1, and the coil group W2 is wound around the second core portion 52 and located. The second winding area B2. The first end of the first winding segment W1 _F is connected to the electrode P2, and the second end of the first winding segment W1 _F extends toward the second winding region B2. The first end of the second winding segment W1 _R is connected to the first winding segment W1 _F , and the second end of the second winding segment W1 _R is connected to the electrode P1. The first end of the third winding segment W2 _F is connected to the electrode P3, and the second end of the third winding segment W2 _F extends toward the direction of the first winding region B1. The first end of the fourth winding segment W2 _R is connected to the third winding segment W2 _F , and the second end of the fourth winding segment W2 _R is connected to the electrode P4. In more detail, the first winding segment W1 _F is the forward winding segment of the coil group W1, and the second winding segment W1 _R is the reverse winding segment of the coil group W1; the third winding segment W2 _F is the positive of the coil group W2. The winding section is wound, and the fourth winding section W2 _R is a reverse winding of the coil group W2. The arrangement positions of the electrodes P1 to P4 are arranged to form a quadrangle, wherein a straight line between the electrodes P1 and P4 and a straight line between the electrodes P2 and P3 correspond to a diagonal line of the quadrilateral. _Viewed in the direction of the axis indicated by the arrow S _AXIS , the coil group W1 is wound in a clockwise manner along the axial direction, and the coil group W2 is wound in the counterclockwise direction in the axial direction. In the coil group W1, the first winding section W1 _F overlaps with the second winding section W1 _R. In the coil group W2, the third winding section W2 _F overlaps with the fourth winding section W2 _R.

In the inductor group 30 shown in FIG. 3, the coil group W1 is wound around the first core portion 51 and located in the first winding portion B1, and the coil group W2 is wound around the second core portion 52 and located in the second winding portion B2. . The first end of the first winding segment W1 _F is connected to the electrode P1, and the second end of the first winding segment W1 _F extends toward the second winding region B2. The first end of the second winding segment W1 _R is connected to the first winding segment W1 _F , and the second end of the second winding segment W1 _R is connected to the electrode P2. The first end of the third winding segment W2 _F is connected to the electrode P3, and the second end of the third winding segment W2 _F extends toward the direction of the first winding region B1. The first end of the fourth winding segment W2 _R is connected to the third winding segment W2 _F , and the second end of the fourth winding segment W2 _R is connected to the electrode P4. In more detail, the first winding segment W1 _F is the forward winding segment of the coil group W1, and the second winding segment W1 _R is the reverse winding segment of the coil group W1; the third winding segment W2 _F is the positive of the coil group W2. The winding section is wound, and the fourth winding section W2 _R is a reverse winding of the coil group W2.

In the inductor group 40 shown in FIG. 4, the first winding section W1 _{F of the} coil group W1 is wound around the first core portion 51 and located in the first winding area B1, and the third winding section W2 _{F of the} coil group W2 is wound. The second core 52 is located and located in the second winding zone B2. The first end of the first winding segment W1 _F is connected to the electrode P4, and the second end of the first winding segment W1 _F extends toward the second winding region B2. The first end of the second winding segment W1 _R is connected to the first winding segment W1 _F , and the second end of the second winding segment W1 _R is connected to the electrode P3. The first end of the third winding section W2 _F is connected to the electrode P2, and the second end of the third winding section W2 _F extends toward the direction of the first winding section B1. The first end of the fourth winding segment W2 _R is connected to the third winding segment W2 _F , and the second end of the fourth winding segment W2 _R is connected to the electrode P1. In more detail, the first winding section W1 _F is a winding section of the coil group W1, and the second winding section W1 _R is a final winding section of the coil group W1; the third winding section W2 _F is a winding section of the coil group W2 And the fourth winding section W2 _R is the final winding section of the coil group W2.

In the inductor group 50 shown in FIG. 5, the coil group W1 is wound into a rectangular coil, accommodated or wrapped in the covering portion 85 at the first winding area B1; the coil group W2 is wound into a rectangular coil, accommodated or covered. The second winding area B2 is located inside the covering portion 85. The layout of the electrodes P1 to P4 and the coil groups W1 to W2 in the inductor group 50 is the same as that of the inductor group 10 shown in Fig. 1. However, the shape of the coil groups W1 to W2 does not limit the scope of the present invention.

In the inductor group 60 shown in FIG. 6, the coil group W1 is wound into a circular coil, accommodated or wrapped in the covering portion 85 in the first winding area B1; the coil group W2 is wound into a circular coil, and accommodates or The cladding portion 85 is located in the second winding region B2. The layout of the electrodes P1 to P4 and the coil groups W1 to W2 in the inductance group 60 is the same as that of the inductance group 10 shown in Fig. 1. However, the shape of the coil groups W1 to W2 does not limit the scope of the present invention.

In the present invention, the first winding segment W1 _{F of the} coil group W1 includes M1 turns, the second winding segment W1 _{R of the} coil group W1 includes N1 turns, and the third winding segment W2 _{F of the} coil group W2 includes M2 turns, and the coil set The fourth winding segment W2 _R of W2 contains N2 turns, where M1, M2, N1 and N2 are positive numbers.

In the inductor group 10 shown in FIG. 1, the value of |M1-M2|/M1 is equal to or less than 0.25, the value of |N1-N2|/N1 is equal to or less than 0.25, M1 is greater than or equal to M2, and N1 is greater than or Equal to N2. Fig. 1 shows an embodiment when M1 = M2 = 6 and N1 = N2 = 0.5, but does not limit the scope of the invention.

In the inductance group 20 shown in Fig. 2, M1 = M2 = N1 = N2. Fig. 2 shows an embodiment when M1 = M2 = N1 = N2 = 3, but does not limit the scope of the invention.

In the inductor group 30 shown in Fig. 3 and the inductor group 40 shown in Fig. 4, M1, M2, N1 and N2 can be any positive number that meets the design requirements. Figs. 3 and 4 show an embodiment when M1 = M2 = 6 and N1 = N2 = 0.5, but do not limit the scope of the present invention.

In the inductance group 50 shown in FIG. 5 and the inductance group 60 shown in FIG. 6, the value of |M1-M2|/M1 is equal to or smaller than 0.25, and the value of |N1-N2|/N1 is equal to or less than 0.25. . Fig. 5 and Fig. 6 show an embodiment when M1 = M2 = 4 and N1 = N2 = 0.5, but do not limit the scope of the invention.

As is well known in the relevant art, the value of the magnetic flux induced by the conductive coil set is related to the current value flowing through the coil set, the material of the coil set, and the number of turns of the coil set. In one embodiment, the coil sets W1 W W2 can be implemented using the same material. However, the material of the coil groups W1 to W2 does not limit the scope of the present invention.

The inductor groups shown in Figures 1, 2, 5, and 6 can be directly implemented as different configurations of the coupled inductor devices 11 to 13 for use in the PoE system 100 as shown in Figures 7-9. The inductor group shown in Figures 3 and 4 can be implemented as a different configuration of the coupled inductive devices 11 to 13 together with a compensation capacitor for use in the PoE system 100 as shown in Figures 7-9. The PoE system 100 includes a PSE 110, a PD 120, and one or more sets of data transmission lines.

According to the PoE and PoDL specifications defined in IEEE 802.03, the PSE 110 can transmit power to the PD 120 through one or more sets of data transmission lines. The same set or groups of data transmission lines are also used to perform the physical layer (PHY). ) data transfer. As is well known in the relevant art, PHY specifications (eg, 1000BASE-T and 10GBASE-T) are defined using four sets of data transmission pairs, while other PoE systems can use more than four sets of data transmission pairs. For purposes of illustration, Figures 7 through 9 show an embodiment when a set of data transmission lines is used. However, the number of data transmission line pairs does not limit the scope of the present invention.

Each of the coupled inductive devices 11 to 13 may include inductors L1 L L2 to block AC signals on the power transmission path of the data transmission line pair 130. The PoE system 100 may further include capacitors C1 to C2 to block DC signals on the data transmission path of the data transmission line pair 130. For the common mode signal, the power transmission path of the data transmission line pair 130 includes a first power transmission path (indicated by an arrow S1) and a second power transmission path (indicated by an arrow S2).

In the first configuration, any one of the inductor groups 10, 50, 60 can be implemented as a coupled inductive device 11 for use in the PoE system 100 shown in FIG. 7, and its corresponding equivalent circuit is as shown in FIG. The figure shows. The electrodes P1 and P4 are coupled to the positive end of the PSE 110 or the PD 120 (end point N3), the electrode P2 is coupled to the positive end of the data transmission line pair 130 (end point N1), and the electrode P3 is coupled to the data transmission line pair 130. Negative end (end point N2).

In the second configuration, any one of the inductor groups 10, 50, 60 can be implemented as a coupled inductive device 12 for use in the PoE system 100 shown in FIG. 8, and its corresponding equivalent circuit is as shown in FIG. The figure shows. The electrode P1 is coupled to the positive end of the PSE 110 or the PD 120 (end point N3), the electrode P2 is coupled to the negative end of the data transmission line pair 130 (end point N2), and the electrode P3 is coupled to the negative end of the PSE 110 or the PD 120. (End point N4), and the electrode P4 is coupled to the positive terminal (end point N1) of the data transmission line pair 130.

In the third configuration, any one of the inductor groups 10, 50, 60 can be implemented as a coupled inductive device 11 for use in the PoE system 100 shown in FIG. 7, and its corresponding equivalent circuit is as shown in FIG. The figure shows. The electrodes P2 and P3 are coupled to the positive end of the PSE 110 or the PD 120 (end point N3), the electrode P1 is coupled to the positive end of the data transmission line pair 130 (end point N1), and the electrode P4 is coupled to the data transmission line pair 130. Negative end (end point N2).

As shown in the equivalent circuit of the first to third configurations in FIG. 10, the coil groups W1 to W2 are disposed in a symmetrical manner, and the coils closest to each other among the two coil groups W1 to W2 are also disposed in a symmetrical manner. A parasitic capacitance Ci with a capacitance across the coil is formed. The cross-coil capacitance value between the electrodes P1 and P4 substantially caused by the coils closest to each other in the two coil groups W1 to W2 is a balance capacitance value, so that the inductance value L1 of the coil group W1 and the inductance value L2 of the coil group W2 The electromotive forces induced at the electrodes P1 and P4 are substantially equal. When the common mode signal strikes the inductor group 10, 50, 60, the inductance value L1 of the coil group W1 and the inductance value L2 of the coil group W2 are equal and the coil capacitance value is the coil closest to each other among the two coil groups W1 W W2. As a result, two AC currents will cause two EMFs of the same size in the two coil groups along their flow direction. As described above, the cross-coil capacitance value is a balanced capacitance value, which maintains the two coil groups W1 W W2 at substantially equal potentials to maintain the two EMFs at substantially equal values, thus not flowing through the electrode P1 The bypass current of the parasitic capacitance Ci between P4 and P4 destroys the balance of the two EMFs. Therefore, the balanced two EMFs cause a zero voltage difference between the electrodes P1 and P4, which can reduce differential mode interference or equivalently avoid common mode noise being converted into differential mode interference. When the cross-coil capacitance value is caused by the coils closest to each other in the two coil groups W1 to W2, the potentials of the electrodes P1 and P4 are the same but the polarities are opposite, so that the zero-voltage is generated when the coupled inductive device 11 transmits the differential mode data signal. Poor, and thus avoid common mode interference being converted. The invention can improve the stability of the power supply system and the quality of the data processing system in the PoE system 100, and can avoid becoming an EMI source.

In the fourth configuration, the inductor group 20 can be implemented as a coupled inductive device 11 for use in the PoE system 100 shown in FIG. 7, and its corresponding equivalent circuit is as shown in FIG. The electrodes P1 and P4 are coupled to the positive end of the PSE 110 or the PD 120 (end point N3), the electrode P2 is coupled to the positive end of the data transmission line pair 130 (end point N1), and the electrode P3 is coupled to the data transmission line pair 130. Negative end (end point N2). L1 _F represents the inductance value induced by the first winding segment W1 _F (the number of turns is M1) in the coil group W1, and L1 _R represents the inductance value induced by the second winding segment W1 _R (the number of turns is N1) in the coil group W1. L2 _F represents the inductance value induced by the third winding segment W2 _F (the number of turns is M2) in the coil group W2, and L2 _R represents the inductance value induced by the fourth winding segment W2 _R (the number of turns N2) in the coil group W2 .

In the fifth configuration, the inductor group 20 can be implemented as a coupled inductive device 12 for use in the PoE system 100 shown in FIG. 8, and its corresponding equivalent circuit is as shown in FIG. The electrode P1 is coupled to the positive end of the PSE 110 or the PD 120 (end point N3), the electrode P2 is coupled to the negative end of the data transmission line pair 130 (end point N2), and the electrode P3 is coupled to the positive end of the data transmission line pair 130 ( End point N1), and electrode P4 is coupled to the negative end of PSE 110 or PD 120 (end point N4). L1 _F represents the inductance value induced by the first winding segment W1 _F (the number of turns is M1) in the coil group W1, and L1 _R represents the inductance value induced by the second winding segment W1 _R (the number of turns is N1) in the coil group W1. L2 _F represents the inductance value induced by the third winding segment W2 _F (the number of turns is M2) in the coil group W2, and L2 _R represents the inductance value induced by the fourth winding segment W2 _R (the number of turns N2) in the coil group W2 .

As shown in the corresponding circuit corresponding to the fourth and fifth configurations in FIG. 11, the coil groups W1 to W2 are disposed in a symmetrical manner, and the coils closest to each other among the two coil groups W1 to W2 are also disposed in a symmetrical manner. A parasitic capacitance Ci with a capacitance across the coil is formed. The cross-coil capacitance value between the electrodes P1 and P4 substantially caused by the coils closest to each other (the two ends of the parasitic capacitance Ci) of the two coil groups W1 to W2 is a balance capacitance value, so that the inductance value L1 of the coil group W1 The electromotive force induced by the inductance value L2 of the coil group W2 is substantially equal to avoid noise generation during differential mode-common mode conversion. Since the two ends of the parasitic capacitance Ci can be maintained at substantially equal potentials, the cross-coil capacitance value can maintain the two EMFs at substantially equal values, so that no bypass current flowing through the parasitic capacitance Ci is generated and the two EMFs are destroyed. Balance. Therefore, the balanced two EMFs cause a zero voltage difference between the two ends of the parasitic capacitance Ci, which can reduce differential mode interference or equivalently avoid common mode noise being converted into differential mode interference. When the cross-coil capacitance value is caused by the coil closest to each other in the two coil groups W1 to W2, the parasitic capacitance Ci has the same potential but opposite polarity at both ends, and thus is generated when the coupled inductive device 11 transmits the differential mode data signal. Zero voltage difference, thus avoiding common mode interference being converted. The invention can improve the stability of the power supply system and the quality of the data processing system in the PoE system 100, and can avoid becoming an EMI source.

The inductor group 30 shown in FIG. 3 can be implemented as a coupled inductor device 13 together with a compensation capacitor Cc for use in the PoE system 100 shown in FIG. As shown in the corresponding equivalent circuit in Fig. 12, the coils closest to each other among the coil groups W1 to W2 form a parasitic capacitance Ci with a capacitance across the coil between the electrodes P2 and P4. This cross-coil capacitance value is an unbalanced capacitance value and may cause a bypass current flowing through the parasitic capacitance Ci. However, the compensation capacitor Cc disposed between the coil groups W1 to W2 in a balanced manner for the parasitic capacitance Ci can compensate for the effect of the parasitic capacitance Ci. More specifically, the compensation capacitor Cc is coupled between the electrodes P1 and P3 to compensate for the effect of the parasitic capacitance Ci between the electrodes P2 and P4. The compensation capacitor Cc can induce another bypass current to offset the bypass of the parasitic capacitance Ci when the common mode signal strikes the coil group W1~W2 or when the coil group W1~W2 is transmitting the differential mode data signal. The current, in turn, maintains the equilibrium state of the two EMFs on the coil groups W1 to W2. Since the two EMFs generated by the common mode noise are maintained in an equilibrium state with equal values, the voltage difference between the electrodes P1 and P4 and the voltage difference between the electrodes P2 and P3 are maintained at zero, which can reduce differential mode interference. Or equivalently avoiding common mode noise being converted into differential mode interference. Similarly, since the two EMFs generated by the differential mode data signal are maintained in an equilibrium state with equal values, the potentials of the electrodes P1 and P4 are equal but opposite in polarity, and the potentials of the electrodes P2 and P3 are equal but opposite in polarity, thereby reducing common mode interference. Or equivalently avoiding differential mode noise being converted to common mode interference. The invention can improve the stability of the power supply system and the quality of the data processing system in the PoE system 100, and can avoid the generation of EMI sources.

The inductor group 40 shown in FIG. 4 can be implemented as a coupled inductor device 13 together with a compensation capacitor Cc for use in the PoE system 100 shown in FIG. As shown by the corresponding equivalent circuit in Fig. 13, the coils closest to each other among the coil groups W1 to W2 form a parasitic capacitance Ci with a capacitance across the coil between the electrodes P1 and P3. This cross-coil capacitance value is an unbalanced capacitance value and may cause a bypass current flowing through the parasitic capacitance Ci. However, the compensation capacitor Cc disposed between the coil groups W1 to W2 in a balanced manner for the parasitic capacitance Ci can compensate for the effect of the parasitic capacitance Ci. More specifically, the compensation capacitor Cc is coupled between the electrodes P2 and P4 to compensate for the effect of the parasitic capacitance Ci between the electrodes P1 and P3. The compensation capacitor Cc can induce another bypass current to offset the bypass of the parasitic capacitance Ci when the common mode signal strikes the coil group W1~W2 or when the coil group W1~W2 is transmitting the differential mode data signal. The current, in turn, maintains the equilibrium state of the two EMFs on the coil groups W1 to W2. Since the two EMFs generated by the common mode noise are maintained in an equilibrium state with equal values, the voltage difference between the electrodes P1 and P4 and the voltage difference between the electrodes P2 and P3 are maintained at zero, which can reduce differential mode interference. Or equivalently avoiding common mode noise being converted into differential mode interference. Similarly, since the two EMFs generated by the differential mode data signal are maintained in an equilibrium state with equal values, the potentials of the electrodes P1 and P4 are equal but opposite in polarity, and the potentials of the electrodes P2 and P3 are equal but opposite in polarity, thereby reducing common mode interference. Or equivalently avoiding differential mode noise being converted to common mode interference. The invention can improve the stability of the power supply system and the quality of the data processing system in the PoE system 100, and can avoid becoming an EMI source.

In the PoE system 100 shown in FIG. 9 and the equivalent circuit of the various configurations shown in FIGS. 12 to 13, the value of the compensation capacitor Cc may be 90% and 110% times the value of the parasitic capacitance Ci. between. In a preferred embodiment of the invention, the value of the compensation capacitor Cc and the value of the parasitic capacitance Ci are substantially equal.

The coupled inductive device of the present invention can be applied to a PoE system including a PSE, a PD, and at least one set of data transmission pairs. At least one set of data transmissions can provide a first power path and a second power path between the PSE and the PD, as shown in Figures 7-9. However, the coupled inductive device of the present invention can also be applied to other types of power supply systems.

In the present invention, the coupled inductive device includes two coils W1 to W2 arranged in such a manner that the cross-coil capacitance value formed between the two coils W1 to W2 and the inductance value L1 of the coil group W1 and the inductance value L2 of the coil group W2 are The induced electromotive forces are substantially equal. When current flows through the unbalanced parasitic capacitance Ci, the present invention teaches that a compensation capacitor Cc is provided between the two coils W1 to W2 to maintain a balanced bypass state. The coupled inductor device of the present invention adopts two coil sets of a specific arrangement or a compensation capacitor Cc to maintain the electromotive forces respectively induced on the two coils W1 W W2 substantially equal to avoid differential mode-common mode conversion or Common mode-differential mode conversion. Therefore, the coupled inductive device of the present invention can improve the mode switching characteristics for use in an Ethernet power supply system or other systems. The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

A1‧‧‧ first end position
A2‧‧‧ second end position
B1‧‧‧First winding area
B2‧‧‧second winding area
C1~C2‧‧‧ capacitor
Ci‧‧‧ parasitic capacitance
Cc‧‧‧compensation capacitor
L1~L2, L1 _F , L1 _R , L2 _F , L2 _R , L2‧‧‧Inductors
N1~N4‧‧‧ endpoint
P1~P4‧‧‧electrode
PHY‧‧‧ physical layer
S _AXIS ‧‧‧Axis direction
S1‧‧‧First power transmission path
S2‧‧‧second power transmission path
W1~W2‧‧‧ coil set
W1 _F ‧‧‧First winding section
W1 _R ‧‧‧second winding section
W2 _F ‧‧‧third winding segment
W2 _R ‧‧‧fourth winding section
10, 20, 30, 40, 50, 60‧‧‧Inductance group
11~13‧‧‧coupled inductor device
51‧‧‧First core
52‧‧‧Second core
61‧‧‧First end
62‧‧‧second end
70‧‧‧ layered department
85‧‧‧Covering Department
100‧‧‧PoE system
110‧‧‧Power supply unit
120‧‧‧Power receiving device
130‧‧‧Data transmission line pair

1 to 6 are schematic views showing the structure of an inductor group of a coupled inductor device according to an embodiment of the present invention. 7 to 9 are schematic views of the coupled inductor device applied to the PoE system according to an embodiment of the present invention. 10 to 13 are schematic diagrams showing an equivalent circuit of the coupled inductor device in each configuration in the embodiment of the present invention.

A1‧‧‧ first end position

A2‧‧‧ second end position

B1‧‧‧First winding area

B2‧‧‧second winding area

P1~P4‧‧‧electrode

S _AXIS ‧‧‧Axis direction

W1~W2‧‧‧ coil set

W1 _F ‧‧‧First winding section

W1 _R ‧‧‧second winding section

W2 _F ‧‧‧third winding segment

W2 _R ‧‧‧fourth winding section

10‧‧‧Inductance group

51‧‧‧First core

52‧‧‧Second core

61‧‧‧First end

62‧‧‧second end

70‧‧‧ layered department

Claims (20)

A coupled inductor device includes: a first electrode and a second electrode disposed at a first end position along an axial direction; a third electrode and a fourth electrode disposed at a direction along the axis a first end position; a first winding area and a second winding area in the axial direction; a first coil group wound around the first winding area, and comprising: a first winding section, the first One end is connected to the second electrode, and the second end thereof extends in a direction toward the second winding area; and a second winding section has a first end connected to the first winding section, and the first end thereof a second end extending toward the first end position to be connected to the first electrode; and a second coil group wound around the second winding area, and comprising: a third winding segment, the first end of which is connected to the a third electrode having a second end extending toward the first winding region; and a fourth winding segment having a first end connected to the third winding segment and a second end facing the first a two-terminal position extending to connect to the fourth electrode; wherein: the first end position and the second end position The two winding sides are located between the first end position and the second winding area; and the second winding area is located in the first winding area and the second Between the end positions. The coupled inductive device of claim 1, further comprising a material body including a first core disposed corresponding to the first winding region and a second core disposed corresponding to the second winding region a first end portion disposed at the first end position, and a second end portion disposed at the second end position, wherein: the first core portion is coupled to the first end portion; the second core a portion extending from the first core portion and connected to the second end portion; the first electrode and the second electrode are connected to the first end portion; and the third electrode and the fourth electrode are connected to the second end portion unit. The coupled inductive device of claim 2, wherein the body of material further comprises a layer portion coupled to the first end portion and the second end portion. The coupled inductive device of claim 1, further comprising a body of material, the body of material comprising a covering portion for carrying or covering the first coil set and the second coil set. The coupled inductive device of claim 1, wherein: the first winding segment comprises an M1 coil; the second winding segment comprises an N1 coil; the third winding segment comprises an M2 coil; the fourth winding segment comprises an N2 coil; The value of M1-M2|/M1 is less than 0.25; the value of |N1-N2|/N1 is less than 0.25; M1, M2, N1 and N2 are positive numbers; M1 is greater than or equal to M2; and N1 is greater than or equal to N2. The coupled inductive device of claim 5, wherein M1 = M2 and N1 = N2. The coupled inductive device of claim 1, wherein the first winding segment overlaps the second winding segment and the third winding segment overlaps the fourth winding segment. The coupled inductive device of claim 1, wherein: the first coil group and the second coil group are disposed in a symmetrical manner; one of the first coil group and the second portion of the second coil group Forming a symmetrical coil to form a cross-coil capacitor; a first inductance of the first coil group induces a first electromotive force in the first portion; and a second inductance of the second coil group is in the second portion Sensing a second electromotive force; the cross-coil capacitance is such that the value of the first electromotive force and the value of the second electromotive force are substantially equal; the first portion is a coil of the first coil group that is closest to the second coil group; The second portion is the coil of the second coil group that is closest to the first coil group. The coupled inductive device of claim 1, wherein the first coil assembly is wound in a clockwise manner along the axial direction, and the second coil assembly is wound in a counterclockwise manner along the axial direction. . The coupled inductor device of claim 1, wherein the first electrode, the second electrode, the third electrode, and the fourth electrode are arranged to form a quadrilateral, and the second electrode and the third electrode are The straight line corresponds to a pair of diagonal lines of the quadrilateral. The coupled inductor device of claim 1, wherein: the first electrode and the fourth electrode are coupled to a power sourcing equipment (PSE) in a Power over Ethernet (PoE) system. One of the positive ends, or one of the power receiving devices (PDs) of the Ethernet power supply system; the second electrode is coupled to the at least one data transmission line of the Ethernet power supply system One of the positive ends; and the third electrode is coupled to one of the negative ends of the at least one data transmission line pair. The coupled inductive device of claim 1, wherein: the second electrode and the third electrode are coupled to a positive end of a power supply end of an Ethernet power supply system, or coupled to the Ethernet power supply a positive terminal of one of the power receiving devices; the first electrode is coupled to one of the at least one data transmission line pair in the Ethernet power supply system; and the fourth electrode is coupled to the at least one data transmission line One of the negative ends. The coupled inductor device of claim 1, wherein: the first electrode is coupled to a positive end of a power supply end device of the Ethernet power supply system, or coupled to a power receiving end of the Ethernet power supply system One of the positive ends of the device; the second electrode is coupled to one of the negative ends of the at least one data transmission line pair in the Ethernet power supply system; the third electrode is coupled to one of the negative ends of the power supply device, or coupled The negative terminal of one of the power receiving end devices; and the fourth electrode is coupled to one of the positive ends of the at least one data transmission line pair. A coupled inductor device includes: a first electrode and a second electrode disposed at a first end position along an axial direction; a third electrode and a fourth electrode disposed at a direction along the axis a first end position; a first winding area and a second winding area in the axial direction; a first coil group wound around the first winding area, and comprising: a first winding section, the first One end is connected to the first electrode, and the second end thereof extends in a direction toward the second winding area; and a second winding section has a first end connected to the first winding section, and the first end thereof a second end is connected to the second electrode; a second coil group is wound around the second winding area, and comprises: a third winding section, the first end of which is connected to the third electrode, and the second end thereof Extending in a direction of the first winding region; and a fourth winding segment having a first end connected to the third winding segment and a second end connected to the fourth electrode; and a compensation capacitor coupled Between the first coil set and the second coil set; wherein: the first end position and the second Positions are respectively located on two opposite sides of the axial direction; the first winding area is located between the first end position and the second winding area; and the second winding area is located in the first winding area and the first Between the two end positions. The coupled inductive device of claim 14, further comprising a material body disposed along the axial direction, the material body including a first core portion corresponding to the first winding region, corresponding to the second winding a second core portion, a first end portion disposed at the first end position, and a second end portion disposed at the second end position, wherein: the first core portion and the first end portion a second core portion extending from the first core portion and connected to the second end portion; the first electrode and the second electrode being connected to the first end portion; and the third electrode and the fourth portion The electrodes are respectively connected to the second end. The coupled inductor device of claim 15, wherein: the compensation capacitor is coupled between the first electrode and the third electrode to compensate a parasitic capacitance across a coil capacitance value; the parasitic capacitance is formed in the second Between the electrode and the fourth electrode; and the value of the compensation capacitor is between 90% and 110% of the value of the capacitance across the coil. The coupled inductive device of claim 16, wherein the value of the compensation capacitor is substantially equal to the cross-coil capacitance value. A coupled inductor device includes: a first electrode disposed at a first end position along an axial direction; a second electrode disposed at a second end position along the axial direction; a third electrode, The first coil position is disposed at the first end position; a first winding area and a second winding area are located in the axial direction; and a first coil group comprising: a first winding segment wound around the first winding region, a first end of the first winding segment being connected to the fourth electrode, and a second end of the first winding segment facing the second winding a direction of the region extending; and a second winding segment having a first end connected to the first winding segment and a second end connected to the third electrode; a second coil group comprising: a third winding a wire segment wound around the second winding zone, a first end of the third winding segment being connected to the second electrode, and a second end of the third winding segment extending toward the first winding zone And a fourth winding segment, the first end of which is coupled to the third winding segment and the second end thereof a first electrode; and a compensation capacitor coupled between the first coil group and the second coil group; wherein: the first end position and the second end position are respectively located on opposite sides of the axis direction The first winding area is located between the first end position and the second winding area; and the second winding area is located between the first winding area and the second end position. The coupled inductive device of claim 18, further comprising a material body disposed along the axial direction, the material body including a first core portion corresponding to the first winding region, corresponding to the second winding a second core portion, a first end portion disposed at the first end position, and a second end portion disposed at the second end position, wherein: the first core portion and the first end portion a second core portion extending from the first core portion and connected to the second end portion; the first electrode and the fourth electrode are connected to the first end portion; and the second electrode and the fourth portion The electrodes are respectively connected to the second end. The coupled inductor device of claim 19, wherein: the compensation capacitor is coupled between the second electrode and the fourth electrode to compensate a parasitic capacitance across a coil capacitance value; the parasitic capacitance is formed in the first Between the electrode and the third electrode; and the value of the compensation capacitor is between 90% and 110% of the value of the capacitance across the coil.